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Title: Combined oxygen-isotope and U-Pb zoning studies of titanite: New criteria for age preservation

Abstract

Here, titanite is an important U-Pb chronometer for dating geologic events, but its high-temperature applicability depends upon its retention of radiogenic lead (Pb). Experimental data predict similar rates of diffusion for lead (Pb) and oxygen (O) in titanite at granulite-facies metamorphic conditions (T = 650-800°C). This study therefore investigates the utility of O-isotope zoning as an indicator for U-Pb zoning in natural titanite samples from the Carthage-Colton Mylonite Zone of the Adirondack Mountains, New York. Based on previous field, textural, and microanalytical work, there are four generations (types) of titanite in the study area, at least two of which preserve diffusion-related δ 18O zoning. U-Th-Pb was analyzed by SIMS along traverses across three grains of type-2 titanite, which show well-developed diffusional δ 18O zoning, and one representative grain from each of the other titanite generations.

Authors:
 [1];  [2];  [3];  [3];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Wisconsin-Madison, Madison, WI (United States)
  2. The Australian National Univ., Canberra, ACT (Australia)
  3. Univ. of Wisconsin-Madison, Madison, WI (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1257841
Alternate Identifier(s):
OSTI ID: 1251482
Report Number(s):
LA-UR-15-21294
Journal ID: ISSN 0009-2541; PII: S0009254115000303
Grant/Contract Number:  
EAR-0838058; FG02-93ER14389; 9224–10; EAR-1053466; 1355590; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Chemical Geology
Additional Journal Information:
Journal Volume: 398; Journal Issue: C; Journal ID: ISSN 0009-2541
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 47 OTHER INSTRUMENTATION; titanite; U-Pb dating; oxygen isotopes; SIMS; zoning; diffusion; Adirondack mountains

Citation Formats

Bonamici, Chloe E., Fanning, C. Mark, Kozdon, Reinhard, Fournelle, John H., and Valley, John W. Combined oxygen-isotope and U-Pb zoning studies of titanite: New criteria for age preservation. United States: N. p., 2015. Web. doi:10.1016/j.chemgeo.2015.02.002.
Bonamici, Chloe E., Fanning, C. Mark, Kozdon, Reinhard, Fournelle, John H., & Valley, John W. Combined oxygen-isotope and U-Pb zoning studies of titanite: New criteria for age preservation. United States. doi:10.1016/j.chemgeo.2015.02.002.
Bonamici, Chloe E., Fanning, C. Mark, Kozdon, Reinhard, Fournelle, John H., and Valley, John W. Wed . "Combined oxygen-isotope and U-Pb zoning studies of titanite: New criteria for age preservation". United States. doi:10.1016/j.chemgeo.2015.02.002. https://www.osti.gov/servlets/purl/1257841.
@article{osti_1257841,
title = {Combined oxygen-isotope and U-Pb zoning studies of titanite: New criteria for age preservation},
author = {Bonamici, Chloe E. and Fanning, C. Mark and Kozdon, Reinhard and Fournelle, John H. and Valley, John W.},
abstractNote = {Here, titanite is an important U-Pb chronometer for dating geologic events, but its high-temperature applicability depends upon its retention of radiogenic lead (Pb). Experimental data predict similar rates of diffusion for lead (Pb) and oxygen (O) in titanite at granulite-facies metamorphic conditions (T = 650-800°C). This study therefore investigates the utility of O-isotope zoning as an indicator for U-Pb zoning in natural titanite samples from the Carthage-Colton Mylonite Zone of the Adirondack Mountains, New York. Based on previous field, textural, and microanalytical work, there are four generations (types) of titanite in the study area, at least two of which preserve diffusion-related δ18O zoning. U-Th-Pb was analyzed by SIMS along traverses across three grains of type-2 titanite, which show well-developed diffusional δ18O zoning, and one representative grain from each of the other titanite generations.},
doi = {10.1016/j.chemgeo.2015.02.002},
journal = {Chemical Geology},
number = C,
volume = 398,
place = {United States},
year = {2015},
month = {2}
}

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